WiFi Mesh Motion Detection Using Signal Strength Changes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motion detection systems in environments like homes and offices are costly and limited by field of view, requiring multiple cameras and sensors, which degrade over time and incur high installation and maintenance costs, while current Wi-Fi based systems are limited to direct connections.
Innovation Solution
A mesh network system using wireless signal strength changes between nodes to detect and locate motion, utilizing a monitor to analyze signal properties and initiate actions based on threshold changes, with adaptive environments adjusting device settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical motion detection technologies (cameras, IR detectors) are used, then motion detection capability is improved, but installation and maintenance costs increase significantly
Solution Approach 1:
The patent replaces optical/mechanical motion detection systems (cameras, IR detectors) with a wireless signal-based detection system. Instead of using physical sensors that require installation and maintenance, the system uses changes in wireless signal characteristics (strength, phase, time of flight) between existing Wi-Fi devices to detect motion, thereby eliminating the need for specialized hardware installation.
Solution Approach 2:
The patent enables existing Wi-Fi devices to serve dual purposes: their original communication function plus motion detection. By analyzing signal variations in the Wi-Fi network, the system allows standard wireless devices to perform motion sensing without requiring dedicated motion detection hardware, thus reducing installation costs.
2Area of stationary object
If multiple cameras and sensors are installed to cover all areas, then detection coverage is improved, but system complexity and cost increase
Solution Approach 1:
The patent allows existing Wi-Fi devices throughout the environment to serve as motion detection nodes. Instead of installing dedicated sensors in strategic locations, any Wi-Fi capable device can participate in motion detection by monitoring signal characteristics, thereby achieving comprehensive coverage without additional hardware installation.
Solution Approach 2:
The system uses the existing Wi-Fi infrastructure and devices already present in the environment to perform motion detection. The Wi-Fi devices self-serve the dual purpose of communication and motion sensing, eliminating the need for separate detection systems and reducing overall system complexity.
3Device complexity
If direct connection Wi-Fi motion detection is used, then system simplicity is improved, but detection versatility is limited
Solution Approach 1:
The patent segments the motion detection function across multiple Wi-Fi devices in the network rather than requiring a single direct connection. Each device independently monitors signal characteristics, and the system aggregates data from multiple nodes to achieve comprehensive motion detection and location identification, thereby maintaining simplicity while enhancing versatility.
Solution Approach 2:
The patent introduces signal strength and phase changes as intermediary indicators of motion. Instead of requiring direct sensor-to-object interaction, the system uses variations in wireless signal characteristics as mediators to indirectly detect motion, enabling versatile detection through existing Wi-Fi infrastructure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Provides efficient and cost-effective motion detection and location identification within environments using existing Wi-Fi infrastructure, reducing installation costs and improving reliability by leveraging existing devices.
Implementation Method 1
detecting motion within a given environment based upon changes in wireless signal strength characteristics between two or more nodes of a mesh network
Data Source
AI summary
A process for detecting motion within an environment includes receiving, at a monitor, first coupling data for a coupling of a first node with a second node. The first node is coupled to the second node which is further coupled to the monitor and thereby form a mesh network. The operations may include: at the monitor, receiving first node identifying data, selecting a first median for a first signal property for a first wireless coupling, monitoring the first signal property, determining, upon detecting a change in the first signal property, whether the first signal property exceeds the first median, determining, when the first signal property exceeds the first median, if the change in the first signal property exceeds a first threshold, initiating a first action when the first threshold is exceeded, and determining whether to resume monitoring of the first signal property when the first threshold is not exceeded.